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The redpanda configuration is by default loaded from and persisted to /etc/redpanda/redpanda.yaml. It is broadly divided into 2 sections, redpanda and rpk.

The redpanda section contains all the runtime configuration, such as the cluster member IPs, the node ID, data directory, and so on. The rpk section contains configuration related to tuning the machine that redpanda will run on.

Here’s a sample of what the config file looks like.

# organization and cluster_id help Vectorized identify your system.
organization: ""
cluster_id: ""

  # The directory where the data will be stored. It must reside on an XFS
  # partition.
  data_directory: "/var/lib/redpanda/data"

  # An integer to identify the current node. Must be unique within the cluster.
  node_id: 1

  # The inter-node RPC server config.
    address: ""
    port: 33145

  # The Kafka API config.
    address: ""
    port: 9092

  # A list of `host` objects, holding known nodes' configuration. If empty, the
  # node will be considered a root node and become available upon startup.
    - node_id: 1
        address: ""
        port: 33145

  # The admin API configuration
    address: ""
    port: 9644

  # Target quota byte rate (bytes/ sec) - 64MB default
  target_quota_byte_rate: 64000000

  # How often (in ms) the background compaction is triggered
  log_compaction_interval: 600000

  # Max bytes per partition on disk before triggering a compaction
  retention_bytes: null

  # delete segments older than this - default 1 week
  delete_retention_ms: 604800000000,

  # Available tuners. Set to true to enable, false to disable.

  # Setup NIC IRQs affinity, sets up NIC RPS and RFS, sets up NIC XPS, increases socket
  # listen backlog, increases the number of remembered connection requests, bans the
  # IRQ Balance service from moving distributed IRQs
  tune_network: true

  # Sets the preferred I/O scheduler for given block devices.
  # It can work using both the device name or a directory, in which the device
  # where directory is stored will be optimized. Sets either 'none' or 'noop' scheduler
  # if supported
  tune_disk_scheduler: true

  # Disables IOPS merging
  tune_disk_nomerges: true

  # Distributes IRQs across cores with the method deemed the most appropriate for the
  # current device type (i.e. NVMe)
  tune_disk_irq: true

  # Disables hyper-threading, sets the ACPI-cpufreq governor to 'performance'. Additionaly
  # if system reboot is allowed: disables Intel P-States, disables Intel C-States,
  # disables Turbo Boost
  tune_cpu: true

  # Increases the number of allowed asynchronous IO events
  tune_aio_events: true

  # Syncs NTP
  tune_clocksource: true

  # Tunes the kernel to prefer keeping processes in-memory instead of swapping them out
  tune_swappiness: true

  # Enables memory locking
  enable_memory_locking: true

  # Installs a custom script to process coredumps and save them to the given directory.
  tune_coredump: true

  # The directory where all coredumps will be saved after they're processed.
  coredump_dir: "/var/lib/redpanda/coredump"

  # (Optional) The vendor, VM type and storage device type that redpanda will run on, in
  # the format <vendor>:<vm>:<storage>. This hints to rpk which configuration values it
  # should use for the redpanda IO scheduler.
  well_known_io: "aws:i3.xlarge:default"